Rotary casting



1,662,592 w. w. WEITLING ET AL Much 13, 1928.

ROTARY CASTING Filed Sept. 5,

1924 3 Sheets-Sheet 1 1 vEmoR ATTORNEYS March 13, 1928. 1,662,592

W. W. WEITLING ET AL ROTARY CASTING Filed Sept. 5, 1924 3 Sheets-Sheet 1vgNToR Mafch 13, 1928. 1,662,592

W. W. WEITLING ET AL.

ROTARY CASTING Filed Sept. 5, 1924 3 Sheets-Sheet 5 NVENTOR S ATTORNEYSPatented Mar. 13, 1928.

' UNITE ssasz .arnr tests.

WILLIAM W. WEITLING, OF COLLEGE POINT, AND AUGUSTUS M. HENRY,

OF BROOK- LYN, NEW YORK, ASSIGNOES T0 WILLIAM VJ. VJEITLING, 0F COLLEGEPOINT, LONG ISLAND, NEW YORK, TRUSTEE FOR HIMSELF; AUGUSTUS M. HENRY,AND ROBERTO M. PEAKE.

ROTARY CASTING.

Application filed September 5, 1924.

Thisinvention relates to the art of casting metals, especially ferrousmetals as iron and even steel, by the rotary or so-callcd centrifugalmethod.

Consequently the invention is of special importance, viewing the scopeof protection contemplated most broadly, in the art of making articlesof annular cross section by the rotary casting method.

The cardinal object of the present invention is to provide methods ofand means for attaining, in connection with an operatively combined moldand boiler structure, the various objects and advantages of the jointinvention of Charles Horton and the abovenamed Augustus d. Henry asdisclosed in their joint application Serial No. 727,417, filed July 22,192-4; for attaining the fur ther objects and advantages of theinvention of said Hortons application Serial No. 727,418, filed July 22,1924 (said Horton application providin a way of avoiding the necessityof rotating the low pressure boiler as well as the high pressure boilerand mold); and for attaining also the objects and advantages of theinvention of said Hortons application Serial No. 782,470, filed August16, 1924 (said Horton application last mentioned providing, for onething, a way of avoiding the necessity even of rotating the highpressure boiler with the mold, and, for another, a way of reducing theoressure-withstanding requirements of said high pressure boiler).

Otherwise expressed, briefly, the present invention has two mainobjects:

First, to provide an improved substitute, to wit, linseed oil, for theliquid for the high pressure boiler stated in said Horton applicationSerial No. 732,470 to be preferred, to wit, mercury-since it has justbeen ascertained that the boiling or vaporization point of'linseed oil,costing immensely less than mercury (a few cents per pound as againsteighty cents), is substantially as high as that of m'ercur and Second,to provide an improved substitute for what may be termed the slip-sleeveforming a permanently inbuilt part of the self-complete mold cartridgedisclosed in said Horton sole application Serial No. 732,470,suchsubstitute being either a mass of pulverized graphite, or a solid sleeveSerial NO. 736,098.

thereof, used in lieu of the steel wool, or steel wool and graphite,conglomeration proposed by Horton in said application Serial No,732,470.

Although linseed oil appears at present to be the perfect material forthe boiling liquid, it is believed that other non-aqueous substances maybe employed, such as other oils.

The invention itself, and other objects sought and advantages attainedthan those hereinabove specifically mentioned, will be most clearlyunderstood from the following description of an exemplifying apparatusas at present preferred, and as illustrated in the accompanyingdrawings, in which 1 is a transverse vertical section taken through theapparatus; and

Figs. 2 and 3 show respectively. the 0pposite ends of the apparatus,these views being partially in vertical longitudinal section andpartially in side elevation.

Similar reference characters refer to similar parts throughout theseveral views ofthe drawings.

Referring now more particularly to such drawings, at l is representedthe mold cavity, at 2 the mold, at 3 the inside shell of the annularboiler containing the linseed oil 4, at 5 the outside shell of saidboiler, at 6 the condensing dome containing the oil vapor and at 7 theheat-absorbing steam boiler. This dome is exteriorly threaded at itscylindrical lower portion as shown in Figs. 1 and 2, which threads takematching internal threads in a steel collar-casting 6*. This casting,which is riveted as shown to shell 5, is welded to shell 5 at dome 6 asindicated to seal the oil chamber and dome hermetically when thepowerful needle valve 8 (of the type commonly used on containers forliquefied gases) is closed.

Through this valve the quantity of oil contained in the annular chamber4 may be changed and also gases under pressure may be introduced forvarying the boiling point of the oil.

The mold 2 is supported in bearings 9 and 10 of the water-cooledHyatt-roller type by means of the conical or taper surfaces 11 and 12.

The mold is arranged to be rotated in these bearings by means not shownand in contact with a heat conducting packing 13 which at present ispreferably a mass of powdered graphite or a solid sleeve of graphite ora cylinder made up of graphite bricks, or of some such graphiteconstruction. Suchpacking persists as a filler-mass between. mold, andsleeve 14, permits the rapid transfer of heat fromthe mold to the shell2 of the oil container, and yet acts as an anti-friction slip-sleeve topermit easy rotation of the mold, in spite of close packing of thegraphite.

The use of the machine shown contemplates moulds of diiferent internaldiameters for various size castings, and consequently the mold and'thegraphite mass are kept together and arranged for easyremoval from thebearings by providing the just-mentioned retaining shell l t whichcontacts the shell 3 and remains stationary with the graphite in use;that is, these elements 2, 13

and 14': constitute the unitary cartridge already mentioned. As shown,the retaining shell 14: is held against longitudinal movement relativelyof the cartridge, but is 1'0 .tatable relative to the remaining parts ofthe cartridge. 'lVhen it is desired to renew the mold, or substitute amold of a different pipe-size, the cartridge is pulled out and anothercartridge inserted. Obviously, the machine is so designed, or.may wellbe so designed, as to take care of a, great range of cartridges ofdifferent diameters, that is, cartridges having molds of differentinternal diameters; each such cartridge, however, having a shell 14 ofthe, same external diameter, the other dimensional problems be ing takencare of by varying the thicknesses of the mold, the shell 14 and theannular filler 13 or the thicknesses of two thereof or the thickness ofthe tiller.

It is desirable, indeed essentiah for most economical operation, thatthe liquid containing chambers be heat insulated as indicated at 15.

lVe claim:

1. In the art of rotary casting, the method of controlling the rate ofheatconduction from the molten-metal pour through the mold, whichinvolves rotating the mold wliilemaintaining the mold in heat-transferrelation to a collection of linseed oil, and confining such collectionof oil adjacent to the mold to vaporize a portion of said liquid.

2. In the art of rotary casting, the method of controlling {the rate ofheat-conduction from the molten-metal pour :through the mold, Whichinvolves rotating the mold while maintaining the mold in heat-transferrelation to a collection of oil, and confining such collection of oiladjacent to the mold to vaporize a portion. of said oil, and while alsoconfining the vaporized portion of such oil, confining a liquidvaporizable at a lower temperature than said oil, and maintaining thetwoliquids in heat-transfer relation.

3. In the art of rotary casting, the method of controlling the rate ofheat-conduction' from the molten-metal pour through the mold, whichinvolves providing a mold, confining an oil in heat transfer relation tothe mold, and rotating'the mold relative to said oil during forming andcooling of a moltenmetal charge in the mold, said oil having avaporization temperature substantially high as liquid mercury.

55. In the art of rotar casting, the method of controlling the rate ofheat-conduction from the molten-metal pour through the mold, whichinvolves providing a mold, confining non-metallic liquid in heattransfer relation-to the mold, and rotating the mold relative to saidliquid during" forming and cooling of-a molten-metal charge in the mold,said liquid having a vaporization temperature substantially as highasliquid mercury but not substantially higher than the 'emperature whereatthe molten metal char (if ferrous metal) attains its third shrink ageduring cooling.

6. In, a rotary casting machine, a rotary mold, an oil boiler inheat-transfer relation to the same, a vaporization chamber for the oilcarried by the boiler, and a steam boiler in heat-transfer relation tosaid chamber.

7. In a rotary casting machine, a rotary mold, an oilboiler inheat-transfer relation to the same, and steam boiler in heat-transferrelation to the oil-boiler.

WILLIAM WV. IVEITLING. AUGUSTUS M. HEN RY.

